Speakers And Sound Devices

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Speakers And Sound Devices

Post  admin on Fri 23 Jul 2010, 2:54 am

A speaker takes an electrical signal and translates it back into physical vibrations to create sound waves. A good speaker produces nearly the same vibrations that a microphone originally recorded and encoded. Speakers do this with one or more drivers.



A driver produces sound waves by rapidly vibrating a flexible cone, or diaphragm. The cone, usually made of paper, plastic or metal, is attached on the wide end to the suspension. The suspension, or surround, is a rim of flexible material that allows the cone to move, and is attached to the driver's metal frame, called the basket. The diaphragm is connected to the voice coil, which is attached to the basket by the spider, a ring of flexible material. The voice coil is a simple electromagnet. The amplifier constantly switches the electrical signal, fluctuating between a positive charge and a negative charge for each wire. The alternating current constantly reverses the magnetic forces between the voice coil and the permanent magnet. This pushes the coil back and forth rapidly, like a piston, which vibrates in front of the speaker, creating sound waves.

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